Pump.



R. A. DORNES.

PUMP.

APPLICATION FILED AUG-7,1912.

1,143,255. PatentedJune 15, 1915.

J 5 r iiw wwmmm INVENTOR J-fiamm,

By Attorneys,

RAYMOND A. DORNES, 0F YORK, N. Y.

Specification of Letters Patent.

Patented June 15, 1915.

Application filed August 7, 1912. Serial No. 713,775.

To all whom it may concern Be it known that I, RAYMOND A. DORNES, a citizen of the Republic of France, residing in the borough of Manhattan, city, county, and State of New York, have invented certain new and useful Improvements in Pumps, of which the following is a specification.

The object of my invention is to produce a pump of simple construction and high efliciency.

The invention relates to that type of pumps in which a series of propeller blade sections are'carried by a shaft, with idler sections interposed between said sections and loosely mounted on said shaft.

One embodiment of my invention is shown in the accompanying drawings in which Figure 1 is an elevation of the pump with part of the casing removed. Figs. 2 and 4: are elevations on a larger scale of an idler and propeller blade section respectively. Fig. 3 is an end view of Fig. 4. Fig. 5 is an elevation on a larger scale of a propeller and idler blade section, the latter having a larger pitch than the former.

Referring to the drawings, A designates a shaft which may be driven from any suitable source, held or carried in bearings B B at the ends of a casing C, which is concentric with the shaft.

D designates a thrust hearing which is preferably constructed with bearingballs.

A cap E is provided which can be screwed into bearing 13' to close its end and make it water-tight. Any suitable means may be provided to render bearing B water-tight. The propeller blade sections P are keyed or fastened to the shaft in any convenient way. The idler blade sections I are mounted adjacent to the propeller blade sections and on the delivery side thereof. They are loosely mounted and, hence, are free to turn independently of the shaft as impelled by the oncoming liquid. The pitch of said propeller and idler blades is in the same direction and may or may not have the same value. Each propeller blade section consists of a hub F and a blade or blades G G which have the same radial depth throughout their length. Preferably two blades are used which are set at 180 with respect to each other. The idler sections are or may be identical with the propeller sections except that they may be made longer 7 or shorter in an axial direction as desired.

The action of. the pump is as follows: YV hen the shaft is turned the water or other liquld is caught by the first propeller section and given a forward movement, which is accompanied incidentally by a whirling or rotative movement of greater or less velocity. The actual direction of flow at this time is nearly at right angles to the propeller blade. Resolving this motion into its two components, it is seen to consist of a forward or work component and of a rotative or lateral component, which latter is detrimental to the high efliciency of the pump. Were this rotation or whirling motion allowed to continue, the friction of the liquid with the walls of the casing would be increased, eddies or local whirls would be set up, and the second propeller turning in a liquid which is rotating in the same direction as said propeller, would have an. extremely low efficiency. To reduce this whirling or rotat'ive motion, with its accompanying friction and eddies, the idler sections are provided which, having a pitch in the same direction as the propeller sections, are caused to rotate in the same direction by this very rotative component, and so tend to prevent liquid passing, unless said liquid is moving in a line parallel to the axis of the shaft. The direc tion of flow is thus rectified in whole or in part by passing the idler section, and the liquid is delivered to the second propeller moving in more nearly a straight line and freer from eddies, which enables said second propeller to work with greater efficiency than would otherwise be possible. This action is repeated throughout the succeeding stages.

By changing the amount of pitch of the idler with respect to that of the propeller, the speed of rotation of the idler and the amount of the rectifying efi ect can be varied. Accordingly the best etliciency is thus determinable by trial or experiment.

Although, in the above description, I have called my invention a pump, I do not wish to limit it to that function exclusively as it will also operate as a motor.

What I claim is l. A pump comprising a shaft, a propeller blade section mounted fixedly thereon, and an idler blade section mounted loosely thereon, the pitch of said propeller and idler blades having the same direction.

2. A pump comprising a shaft, a propeller blade section mounted fixedly thereon and an idler blade section mounted loosely thereon and on the delivery side of such propeller blade section, the pitch of said propeller and idler blades having the same direction.

3. A pump comprising a shaft, aplurality of propeller blade sections mounted fixedly thereon and a plurality of idler blade sections mounted loosely thereon, the pitch of said propeller'and idler blades having the same direction.

4:; A pump comprising a casing, a shaft,

a propeller blade section mounted fixedly thereon, and an idler blade section mounted loosely thereon; the pitch of said propeller and idler blades having the same direction, and being of difl'erent value.

In, Witness whereof, I have hereunto signed'my name in the presence of twosubscribing'witnesses.

RAYMOND A. DORNES. Witnesses: ARTHUR G. FRASER, FRED WHITE.

Copies. of this patent may be obtained for fivecents each, by, addressing the Commissioner ofqratenta Washington, D. G. 

